BOOSTER/NITRO/SR50/F12/OVETTO/STUNT (ref: 509128)

The S1-EVO variator is an evolution of the old S1R variator. The size of the rollers (16x13) gives it a very high stability. The slope of the flanges has been revised to optimise performance. The acceleration is therefore sharper and more linear.

Delivered with ;
- 6 x 16X13 rollers in 4.0g
- 6 x 16X13 rollers in 5.5g